26 - Changes in rainfall patterns

With increasing air and water temperature, evaporation increases. At higher temperatures, the air can hold more water before precipitating (rain). The rainfall pattern is therefore affected by global warming. There is an increase in extreme rain events.

For water vapor to condense, it needs a “core”. Aerosols can constitute this core, promoting the condensation of water vapor and the formation of raindrops.

“A change in land use through deforestation impacts the regulatory role of trees on humidity. Which impacts the rain regime locally. Even globally for tropical and boreal forests. A large oak tree transpires up to 1600 liters of water per day. European forests sweat about 400 mm per year, about half of the continent's precipitation."

The Amazon contributes to the rain regime via the phenomenon of evapotranspiration from trees. Due to the large surface area of ​​the Amazon, its savannahization could lead to a change in the rain regime locally, or even globally.